Italy have now kept three clean sheets in a row but Mancini will be concerned about how long it took his team to break down an inexperienced United States side.

Horvath denied Federico Chiesa in the third minute, the Fiorentina forward then rifling wide of the far post.

In a lively start for the Azzurri, the busy Horvath blocked a Leonardo Bonucci effort after the centre-back was picked out by a clever free-kick from debutant Stefano Sensi.

Horvath tipped over a dipping 20-yard curler from Domenico Berardi in the 39th minute and had to be alert to push away Marco Verratti's inswinging free-kick as Italy kept pushing for the opener.

Half-time substitute Vincenzo Grifo delivered a chipped cross that Verratti could not quite jump high enough to convert as the onslaught continued after the interval.

United States, for whom Christian Pulisic became their youngest captain of the modern era, finally recorded a shot in the 63rd minute when Kellyn Acosta's free-kick found Walker Zimmerman at the back post, but Salvatore Sirigu palmed the defender's header away.

It is seven games in a row under Mancini without a goal in the first half for Italy and their lack of a clinical edge in front of goal was clear to see. Plenty of chances were created and Horvath had a lot to do, but not many of his saves were particularly challenging to pull off. It took Inter team-mates Politano and Gagliardini, both late substitutes, to unlock the US defence.

Horvath repels Azzurri attack

United States were grateful for goalkeeper Horvath, the 23-year-old keeping Italy at bay almost single-handedly. He was perhaps fortunate Italy's finishing was so poor until Politano's late impact, but the Club Brugge goalkeeper showed excellent reflexes. He did not deserve to be on the losing side.

Berardi and Chiesa lacklustre

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Italy have lacked an elite striker for some time and on this evidence, neither Berardi nor Chiesa have the quality required to score regularly at international level. Their work outside the box was adequate but when the chances came they failed to make the most of the opportunities.

What's next?

Focus turns to domestic duties as the next international break is not until March.